Why my mobile eats hell lot of data while on wifi

[Nikunj Rudani]

I have micromax canvas a200 turbo mini. I have start using wifi since last month, Strange thing i was observing, in one month "android os" and google chrome have eat 63 GB of wifi data. I have tried using third party apps, but all are useful when you are using cellular data. I have tried reset factory as well. Please help, Thanks in advance